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// Copyright 2021 The TCell Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use file except in compliance with the License.
// You may obtain a copy of the license at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build linux aix zos solaris
package tcell
import (
"os"
"syscall"
"golang.org/x/sys/unix"
)
// NB: We might someday wish to move Windows to this model. However,
// that would probably mean sacrificing some of the richer key reporting
// that we can obtain with the console API present on Windows.
// nonBlocking changes VMIN to 0, and VTIME to 1. This basically ensures that
// we can wake up the input loop. We only want to do this if we are going to interrupt
// that loop. Normally we use VMIN 1 and VTIME 0, which ensures we pick up bytes when
// they come but don't spin burning cycles.
func (t *tScreen) nonBlocking(on bool) {
fd := int(os.Stdin.Fd())
tio, err := unix.IoctlGetTermios(fd, unix.TCGETS)
if err != nil {
return
}
if on {
tio.Cc[unix.VMIN] = 0
tio.Cc[unix.VTIME] = 0
} else {
// block for any output
tio.Cc[unix.VTIME] = 0
tio.Cc[unix.VMIN] = 1
}
_ = syscall.SetNonblock(fd, on)
// We want to set this *right now*.
_ = unix.IoctlSetTermios(fd, unix.TCSETS, tio)
}
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